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[ Upstream commit263debecb4] When performing a file read from RDMA, smbd_recv() prints an "Invalid msg type 4" error and fails the I/O. This is due to the switch-statement there not handling the ITER_FOLIOQ handed down from netfslib. Fix this by collapsing smbd_recv_buf() and smbd_recv_page() into smbd_recv() and just using copy_to_iter() instead of memcpy(). This future-proofs the function too, in case more ITER_* types are added. Fixes:ee4cdf7ba8("netfs: Speed up buffered reading") Reported-by: Stefan Metzmacher <metze@samba.org> Signed-off-by: David Howells <dhowells@redhat.com> cc: Tom Talpey <tom@talpey.com> cc: Paulo Alcantara (Red Hat) <pc@manguebit.com> cc: Matthew Wilcox <willy@infradead.org> cc: linux-cifs@vger.kernel.org cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org Signed-off-by: Steve French <stfrench@microsoft.com> Signed-off-by: Sasha Levin <sashal@kernel.org>